If you completely remove wire from unit does it still slowdown and stop when you pull trigger?
If yes, then 2 most common problems are
A. Thermistor @ position PTC1 on circuit board
B. Drive Roller Motor
To diagnose, locate thermistor @ position PTC1 in upper middle part of circuit board.
It's yellowish round and about 1/2" in diameter.
Jumper Accross the 2 leads, use a small insulated screwdriver or meter probe.
1. Pull trigger on gun, when motor slows or stops then jumper the leads, if it speeds back up then it's the Thermistor
Replace with a Raychem RXE 1.85A @ 72 v
Or comparable, try EBay
2. If no change, isolate motor by removing the 2 leads and connect a 9-12 volt DC battery source, does motor spin? If not then motor is problem. If motor spins and is constant then additional troubleshooting needed, next possible issues are bad resistor or scr 
SOURCE: hobart handler 135 feed motor for wire doesn't
check the SCR ,looks like a big transistor mounted
to a heat sink or some of the older units had a relay
in-line with a fuse , I have a older Hobart and it is
a great little welder. If you snap a pic of the P.C.
board and email it ill [email protected]
point out what parts to check.and replace.
Rob
SOURCE: Hi I have a Hobart 135 Handler the problem is the
First there is a overload for the drive motor incase the welding wire gets jammed. I've had one of these for a number of years and only recently understood the markings on the drive wheels. When the wheel is installed, the markings for the wire size is for the wire you're using. In other words, the marking is towards you but is indicating the size for the rear groove. For years, I looked at the numbers and assumed that they were for the groove closest to the numbers. I had no problem with solid wire, but with flux core all kinds of trouble. So, make sure you have the right groove for the wire size. Second make sure there are no kinks in your hose. Make sure your contact tips in the gun are the right size for your wire and in good condition A person has e a tendacy to make ther drive wheels tighter when the feed slips, this can cause problems for the flux core wire if the correct drive wheel is not selected.
SOURCE: hobart handler 135 wire feeds for about a two feet
This happens to me all the time. Wear and tear has taken its toll and everything has to be maintained for it to work. Most likely the welding tip is worn and should be replaced. Lincoln electric tips work well and I will replace mine several times during the day. Also check your tension and make sure the wire will uncoil freely from the spool. You can remove the tip and make sure the wire will feed without it. If not, your liner may be worn out. Also a welding Jell will help keep the tip from cloging. It will still happen, but hopefully not on your first weld of the day.
SOURCE: Hello, I have a Hobart
Sound like you have a bad trigger on the gun. Does gas spray when you pull the trigger? Check the wire plug that goes from the pistol to the unit. It should be under the liner hose where it connects to the machine. Then use a voltage meter on the wires going to the drive feed motor, and see if you get current when you pull the trigger. If gas doesn't spray neither, sounds like you got a bad trigger switch
SOURCE: Hobart handler 135, the wire starts to feed for
Hi:
Don't know how old is your unit but my guess is that your gun's liner is the problem. Have you change it lately? If not, change it. Does your machine just stops feeding the wire or does it shuts down? If it just stop then; is the liner, if it shuts down; then you have a pc board problem.
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